ReSlice - Slice your audio with an advanced, rhythmic arpeggiator and FX.
SongMine - Songmine is a free online tool for discovering and recording chord progressions with your favorite DAW.
nlog Synth - Professional Virtual Analogue Synthesizer ::: check nlogmusic at YouTube :::
lightnote - An interactive site to learn the basics of music theory 🎶
cassini - Polyphonic Synthesizer for iPhone/iPod touch
FL Studio Mobile - Create & save multi-track music projects on a smartphone